Die for making twist-drills



(No Model.) A; W. TABER. DIE FOR MAKING TWIST .DRILLS.U

' Patented Mar; 27,1888. v

a top plan view of the anvil-block alone, all the Y in-mt] OFFIGE.

ALBERT iwnsr TABER, or NEWB D MASSACHUSETTS;

DIIE FOR MAKINGTWIST D RILLS.

SPECIFICATION forming partof Letters ram na s q te. dated March 2'7,1888; Application filed May 4. I887. Serial No. 23?.1l2. (No model.)

To aZZ whom it may concern.-

Be it known that I, ALBERT. WEST TA E a citizen of' the United States,residing at New Bedford, in the county of Bristol and State ofMassachusetts, have invented certain new and useful Improvements inMachinesfor Making Twist-Drills; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it app'ertains to makeand use the same.

Figure 1 is a perspective view of the anvilblock, showing the fullerorpiece of steel as in position for use. Fig. 2 is a side elevation of theanvil-block and hammer-head. Fig. 3 isa top plan view of the anvil-blockwith the fuller or steel as in position for use. Fig. 4 is other partsbeingremoved. Fig. 5 is a detail, partially in section, showing theanvil-block and how the fuller can be set at any desired angle. Fig. 6is a detail in section showing how the fuller or steel can be raisedwhen necessary, as when the top is worn ofl'; Fig. 7, a perspective ofone of the guides. Fig. 8 is a horizontal section of the fuller, showingits shape. I 1

My invention relates to the manufacture of twist-drills; and the pointsof noveltyconsist in the construction of a pocket in the anvilblock andin the hammer-head, andin the adjustment in the pocket of apeculiarly-shaped fuller or piece of steel for forging a spiral groovein the drill, and in the construction of a guide for holding the steelof which the drill is made in position when the groove is being formedin it, and in the means for adjusting the fuller or piece oil steel atany desired angle, so as to make any desired twistin the drill, and inthe means used for elevating the fuller or steel as its head becomesworn, and in the construction and combination of the several parts, allas will now be set out and explained, reference being had to theaccompanying drawings.

In the drawings, A denotes the anvil, and B the hammer-head, the latteroperating in any desired way and manner, details of which are notnecessary for the purpose of understanding the scope and aim ofthefpresent invention. Centrally and in the upper or top part of theanvil-block is a recess, a a. The rear part, a,

10 can be held rigidly in position.

of theforward portioina, of this recess is in- ;clined at an angle tothelougitudinal axis of the anvil A, so as to form a suitable seat for'55 the fuller or steel 0, which is rounded upon its zupperend. '0, inthe form of the desired groove that is to bemade in the drill. Thispiece of steel is flat on the bottom 0, its sides 0? paral- 'lel witheach other, its ends 0 being parallel to but oblique to its sides, andis of sufficient length that when placed vertically within. the recess aa it will project sufficiently above the anvil to form the groove in thedrill. The fuller is pushedto the rear of the recess, where 6 5 itsnugly fits, and here it is at an angle with the longitudinal axis ofthe recess of the anvilblock. To retain it in position the metallicblock D, with an angular back face, d,is placed in the recess so as tocome snugly against the fuller, its front end, d, projecting a littlebeyond the front wall of the anvil-block. By means of the metal strap orbar E, which is placed about centrally over the front endof the recessand secured on each 'side by means. of the bolts 6, upon the frontfaceor end of the anvil-block, the metal block D and the fuller Theupper end of the block D is aboutflush with the top of the anvil-block.In like manner in the front edge of the hammerB a similar recess isformed with the angle of its inner end reversed, and in this is placedthe fuller O, which is, in like manner as thefuller G, securedin placeby block and strap and bolts. The angle of the inner end of'the recessin the hammer-head being reversed fromthat in the anvil-block, thefuller G will be in a position diagonally across that of the fuller O. p

When the groove is to be made in the rod or 0 bar of. steel, the rod orbar will be held in position between the guides F, which are made ofbent pieces of metal securely fixed upon the top of the anvil-block andon each.side of the fuller, and project a little above the fuller G. 5These guides can each be adjusted to or from the fuller by means of theslots f in the part which rests upon the top of the anvil-block. Bymerely slackening the nuts which clamp the guides in position they canbe-moved forward or back in the slots and then be firmly secured againupon the top of the block. It will be observed that each guide is placeddiagonally across the anvil-block from side to side,

and by means of this construction the edge of the groove which is beingmade in the drill is kept perfect. In practice this is a matter whichhas proved to be of the greatest value. 5 It may be desirable sometimesto change the angle of the fullers or steel, and in order to do thismetallic shims or wedges G, as shown in' Fig. 5, may be placed betweenthe rear face of the former and the end of the recess, and so the anglecan be increased at will. It will be noted-that the angle at the rear ofthe recess is as little as can be desired, and that the shims or wedgesare simply put in to increase it.

When the top of the former wears down, the former can be adjusted to. aproper height by putting shims or blocks H underneath. The swages I Iupon the anvil-block and hammerhead are thus of ordinary constructionand such as are used to keep the drill at its proper diametrical size.It will be observed by those skilled in this line of invention that thisdevice is applicable for use in a steam, trip, or other hammer, or in aswaging or other machine used for forging.

Having now described my invention,what I consider new, and desire tosecure by Letters Patent, is-- 1. In a machine for making twist-drills,an anvil-block having a recess in its upper front edge angular at therear of its larger part, the 0 fuller 0, made as described, the angularmetallic block D, the strap E, and the bolts e,' substantially as andfor the purpose set forth.

2. In combination with an anvil-block having the recess a, made angular,as described, 5

the fuller C, confined in position, as set forth,

ALBERT WEST TABER.

Witnesses:

MORTIMER REDMAN, M. A. BALLINGER.

